move edges radially from the centre
Someone will probably come up with a better way than this...

If you have a lot of work to do in 4-way symmetry, it's probably worth working under a Mirror modifier in X and Y, or an object-offset Array modifier, based on a target rotated by 90 degrees.

For a one-off, though..


If necessary, create a Custom Orientation from the face the edges have in common
Set Pivot to Median, or 3D Cursor snapped to the appropriate point
SShiftZ Scale  the edges outward
CtrlC copy the scale from the Adjust Last Operation panel
Reset Orientation to Normal, and Pivot to Individual Origins
S scale, and in the Adjust Last Operation panel, swipe to select X,Yand Z fields together and type in to one of them:  1/CtrlV